Both are easy to care for IMO, the Colombians will just require a lot more room.
Pros: BCIs are great eaters and not easily stressed like some balls. They come in lots of morphs too. More active than balls so they can be good display snakes.
Cons (wouldn't consider it a "con" but it could be I suppose): males will need at least a 4' cage and I recommend 6' for females. Adults will require larger feeders than adult balls which may result in more money but you are fine to feed adults every ~2-3 weeks. Babies/subadults are still good to start in tubs. If you don't have experience handling larger snakes I'd see if you can handle an adult to make sure they're in your comfort level.
And some tid bits: Colombians are spelled with a "u" and Colombians are not "true red tails" so I don't call my Colombians, Hog, and Argentines "red tails".
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